Search results for: Anker Degn Jensen

Items from 1 to 20 out of 57 results

article

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS₂/MgAl₂O₄ Catalysts

Trine M. H. Dabros, Hendrik Kramer, Martin Høj, Paul Sprenger, more

Topics in Catalysis > 2019 > 62 > 7-11 > 752-763

The hydrodeoxygenation (HDO) of ethylene glycol over MgAl₂O₄ supported NiMo and CoMo catalysts with around 0.8 and 3 wt% Mo loading was studied in a continuous flow reactor setup operated at 27 bar H₂ and 400 °C. A co-feed of H₂S of typically 550 ppm was beneficial for both deoxygenation and hydrogenation and for enhancing catalyst stability. With 2.8–3.3 wt% Mo, a total carbon based gas yield of...

article

Mapping Support Interactions in Copper Catalysts

Rishika Chatterjee, Sebastian Kuld, Roy Berg, Aling Chen, more

Topics in Catalysis > 2019 > 62 > 7-11 > 649-659

Intrinsic activity is often reported as a Turnover Frequency (TOF) of an active phase and is determined from an overall activity and a specific active surface area. The latter parameter is often determined by selective chemisorption techniques, but (strong) metal-support interactions, (S)MSI, between the metal and the carrier in an interplay with the nature of the probe molecules may distort the measurements...

article

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

Trine M.H. Dabros, Magnus Zingler Stummann, Martin Høj, Peter Arendt Jensen, more

Progress in Energy and Combustion Science > 2018 > 68 > C > 268-309

This review presents and discusses the progress in combining fast pyrolysis and catalytic hydrodeoxygenation (HDO) to produce liquid fuel from solid, lignocellulosic biomass. Fast pyrolysis of biomass is a well-developed technology for bio-oil production at mass yields up to ∼75%, but a high oxygen content of 35–50 wt% strongly limits its potential as transportation fuel. Catalytic HDO can be used...

article

SO₂ Oxidation Across Marine V₂O₅-WO₃-TiO₂ SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration

Steen R. Christensen, Brian B. Hansen, Keld Johansen, Kim H. Pedersen, more

Emission Control Science and Technology > 2018 > 4 > 4 > 289-299

The undesired oxidation of SO₂ was studied experimentally at elevated pressures of up to 4.5 bar across two commercial vanadium-based (1.2 and 3 wt% V₂O₅) selective catalytic reduction (SCR) catalysts. This pressure range is of interest for preturbine SCR reactor configuration for NO_x reduction on ships. The residence time in the catalyst was kept constant, independent on pressure, by adjusting the...

article

Influence of H2O and H2S on the composition, activity, and stability of sulfided Mo, CoMo, and NiMo supported on MgAl2O4 for hydrodeoxygenation of ethylene glycol

Trine Marie Hartmann Dabros, Abhijeet Gaur, Delfina Garcia Pintos, Paul Sprenger, more

Applied Catalysis A: General > 2018 > 551 > C > 106-121

In this work, density functional theory (DFT), catalytic activity tests, and in-situ X-ray absorption spectroscopy (XAS) was performed to gain detailed insights into the activity and stability of MoS₂, Ni-MoS₂, and Co-MoS₂ catalysts used for hydrodeoxygenation (HDO) of ethylene glycol upon variation of the partial pressures of H₂O and H₂S. The results show high water tolerance of the catalysts and...

article

Catalytic Science and Technology in Sustainable Energy II

Yuxin Wang, Feng-Shou Xiao, Kulathu K. Seshan, Anker Degn Jensen, more

Catalysis Today > 2017 > 298 > C > 1

article

The Effect of Pt Particle Size on the Oxidation of CO, C₃H₆, and NO Over Pt/Al₂O₃ for Diesel Exhaust Aftertreatment

Thomas Klint Hansen, Martin Høj, Brian Brun Hansen, Ton V. W. Janssens, more

Topics in Catalysis > 2017 > 60 > 17-18 > 1333-1344

Platinum-based oxidation catalysts applied for diesel exhaust aftertreatment constitute a significant part of system costs. Effective utilization of platinum is therefore relevant to reduce costs while retaining performance. To this end, the influence of Pt particle size on catalytic activity for CO, hydrocarbon, and NO oxidation was studied. 1 wt% Pt/Al₂O₃ catalysts were prepared by wet impregnation,...

article

Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling

Jakob Dragsbæk Duhn, Anker Degn Jensen, Stig Wedel, Christian Wix

Journal of Power Sources > 2016 > 336 > Complete > 261-271

Design of a gas distributor to distribute gas flow into parallel channels for Solid Oxide Cells (SOC) is optimized, with respect to flow distribution, using Computational Fluid Dynamics (CFD) modelling. The CFD model is based on a 3d geometric model and the optimized structural parameters include the width of the channels in the gas distributor and the area in front of the parallel channels. The flow...

article

Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperatures

Anna Trubetskaya, Peter Arendt Jensen, Anker Degn Jensen, Peter Glarborg, more

Biomass and Bioenergy > 2016 > 94 > C > 117-129

The concentration and type of free radicals from the decay (termination stage) of pyrolysis at slow and fast heating rates and at high temperatures (above 1000°C) in biomass char have been studied. A room-temperature electron spin resonance spectroscopy study was conducted on original wood, herbaceous biomass, holocelluloses, lignin and their chars, prepared at high temperatures in a wire mesh reactor,...

article

Effects of several types of biomass fuels on the yield, nanostructure and reactivity of soot from fast pyrolysis at high temperatures

Anna Trubetskaya, Peter Arendt Jensen, Anker Degn Jensen, Angel David Garcia Llamas, more

Applied Energy > 2016 > 171 > C > 468-482

This study presents the effect of biomass origin on the yield, nanostructure and reactivity of soot. Soot was produced from wood and herbaceous biomass pyrolysis at high heating rates and at temperatures of 1250 and 1400°C in a drop tube furnace. The structure of solid residues was characterized by electron microscopy techniques, X-ray diffraction and N₂ adsorption. The reactivity of soot was investigated...

article

Promoted V2O5/TiO2 catalysts for selective catalytic reduction of NO with NH3 at low temperatures

Siva Sankar Reddy Putluru, Leonhard Schill, Anita Godiksen, Raju Poreddy, more

Applied Catalysis B: Environmental > 2016 > 183 > C > 282-290

The influence of varying the V₂O₅ content (3–6wt.%) was studied for the selective catalytic reduction (SCR) of nitrogen oxides by ammonia on heteropoly acid (HPA)- and tungsten oxide (WO₃)-promoted V₂O₅/TiO₂ catalysts. The SCR activity and alkali deactivation resistance of HPA-promoted V₂O₅/TiO₂ catalysts was found to be much higher than for WO₃- promoted catalysts. By increasing the vanadium content...

article

Effect of fast pyrolysis conditions on biomass solid residues at high temperatures

Anna Trubetskaya, Peter Arendt Jensen, Anker Degn Jensen, Angel David Garcia Llamas, more

Fuel Processing Technology > 2016 > 143 > Complete > 118-129

Fast pyrolysis of wood and straw was conducted in a drop tube furnace (DTF) and compared with corresponding data from a wire mesh reactor (WMR) to study the influence of temperature (1000–1400)°C, biomass origin (pinewood, beechwood, wheat straw, alfalfa straw), and heating rate (10³°C/s, 10⁴°C/s) on the char yield and morphology. Scanning electron microscopy (SEM), elemental analysis, and ash compositional...

article

Comparison of high temperature chars of wheat straw and rice husk with respect to chemistry, morphology and reactivity

Anna Trubetskaya, Peter Arendt Jensen, Anker Degn Jensen, Markus Steibel, more

Biomass and Bioenergy > 2016 > 86 > C > 76-87

Fast pyrolysis of wheat straw and rice husk was carried out in an entrained flow reactor at high-temperatures (1000–1500) °C. The collected char was analyzed using X-ray diffractometry, N₂-adsorption, scanning electron microscopy, particle size analysis with CAMSIZER XT, ²⁹Si and ¹³C solid-state nuclear magnetic resonance spectroscopy and thermogravimetric analysis to investigate the effect of inorganic...

article

Preface

Yuxin Wang, Feng-Shou Xiao, Kulathu K. Seshan, Anker Degn Jensen, more

Catalysis Today > 2016 > 259 > P2 > 245

article

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Anna Trubetskaya, Peter Arendt Jensen, Anker Degn Jensen, Markus Steibel, more

Fuel Processing Technology > 2015 > 140 > Complete > 205-214

Fast pyrolysis of biomass (wood, straw, rice husk) and its major components (cellulose, hemicellulose, lignin) was conducted in a wire mesh reactor. The aim of this study was to understand the influence of temperature (350–1400^∘C), heating rate (10–3000^∘C/s), particle size (0.05–2mm) and holding time (1–4s) on the char morphology and char yield. Scanning electron microscopy (SEM) and elemental analysis...

article

Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene

Kirsten Schuh, Wolfgang Kleist, Martin Høj, Anker Degn Jensen, more

Journal of Solid State Chemistry > 2015 > 228 > C > 42-52

A variety of morphologically different α-MoO₃ samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO₃ prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1–2 led to ammonium containing molybdenum oxide phases...

article

Modeling of temperature profiles in an environmental transmission electron microscope using computational fluid dynamics

Peter Mølgaard Mortensen, Thomas Willum Hansen, Jakob Birkedal Wagner, Anker Degn Jensen

Ultramicroscopy > 2015 > 152 > C > 1-9

The temperature and velocity field, pressure distribution, and the temperature variation across the sample region inside an environmental transmission electron microscope (ETEM) have been modeled by means of computational fluid dynamics (CFD). Heating the sample area by a furnace type TEM holder gives rise to temperature gradients over the sample area. Three major mechanisms have been identified with...

article

Mn/TiO2 and Mn–Fe/TiO2 catalysts synthesized by deposition precipitation—promising for selective catalytic reduction of NO with NH3 at low temperatures

Siva Sankar Reddy Putluru, Leonhard Schill, Anker Degn Jensen, Bernard Siret, more

Applied Catalysis B: Environmental > 2015 > 165 > C > 628-635

Mn/TiO₂ and Mn–Fe/TiO₂ catalysts have been prepared by impregnation (IMP) and deposition-precipitation (DP) techniques and characterized by N₂ physisorption, XRPD, NH₃-TPD, H₂-TPR, XPS and TGA. 25wt% Mn_0.75Fe_0.25Ti-DP catalyst, prepared by deposition precipitation with ammonium carbamate (AC) as a precipitating agent, showed superior low-temperature SCR (selective catalytic reduction) of NO with NH...

article

MnFe/Al₂O₃ Catalyst Synthesized by Deposition Precipitation for Low-Temperature Selective Catalytic Reduction of NO with NH₃

Leonhard Schill, Siva Sankar Reddy Putluru, Anker Degn Jensen, Rasmus Fehrmann

Catalysis Letters > 2015 > 145 > 9 > 1724-1732

Mn–Fe/Al₂O₃ and Mn–Fe/TiO₂ catalysts have been prepared by impregnation (IMP) and deposition precipitation (DP) and characterized with several techniques including: XRDP, N₂-physisorption, NH₃-TPD, H₂-TPR, TGA and XPS. 40 wt% Mn_0.75Fe_0.25/Al₂O₃ prepared with ammonia carbamate as precipitating agent showed the same superior low temperature selective catalytic reduction of NO with NH₃ as did 25 wt%...

article

Effect of Fe doping on low temperature deNOx activity of high-performance vanadia anatase nanoparticles

Leonhard Schill, Siva Sankar Reddy Putluru, Anker Degn Jensen, Rasmus Fehrmann

Catalysis Communications > 2014 > 56 > Complete > 110-114

VFe/TiO ₂ catalysts have been prepared using a solgel based method. Fe was introduced using 3 different methods. The resulting substances were characterized with N ₂ -physisorption, NH ₃ -TPD, H ₂ -TPR, XPS and XRD. Extrudates of the VFe/TiO ₂ powders were prepared using sepiolite (20wt.%) as binder. The activities of the composite materials in the selective...

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Search results for: Anker Degn Jensen

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS₂/MgAl₂O₄ Catalysts

Mapping Support Interactions in Copper Catalysts

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

SO₂ Oxidation Across Marine V₂O₅-WO₃-TiO₂ SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration

Influence of H2O and H2S on the composition, activity, and stability of sulfided Mo, CoMo, and NiMo supported on MgAl2O4 for hydrodeoxygenation of ethylene glycol

Catalytic Science and Technology in Sustainable Energy II

The Effect of Pt Particle Size on the Oxidation of CO, C₃H₆, and NO Over Pt/Al₂O₃ for Diesel Exhaust Aftertreatment

Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling

Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperatures

Effects of several types of biomass fuels on the yield, nanostructure and reactivity of soot from fast pyrolysis at high temperatures

Promoted V2O5/TiO2 catalysts for selective catalytic reduction of NO with NH3 at low temperatures

Effect of fast pyrolysis conditions on biomass solid residues at high temperatures

Comparison of high temperature chars of wheat straw and rice husk with respect to chemistry, morphology and reactivity

Preface

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene

Modeling of temperature profiles in an environmental transmission electron microscope using computational fluid dynamics

Mn/TiO2 and Mn–Fe/TiO2 catalysts synthesized by deposition precipitation—promising for selective catalytic reduction of NO with NH3 at low temperatures

MnFe/Al₂O₃ Catalyst Synthesized by Deposition Precipitation for Low-Temperature Selective Catalytic Reduction of NO with NH₃

Effect of Fe doping on low temperature deNOx activity of high-performance vanadia anatase nanoparticles

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